A bit of a lost opportunity, because I've barely heard about Pinboard, and the fact of them celebrating the passage of time since they were found, is extremely trivial. BTW, MySpace recently turned eleven.
When writing posts and news, typically you want the headline to focus on a new feature, a new app, or if it'll be a number, focus on a meaningful number, like number of users, something that could engage those who aren't engaged right now.
Way it is, a birthday party of some company I know little about is someone else's party, and I won't even open the article.